The sympathetic nerve and the parasympathetic nerve work together to maintain body balance.

交感神经和副交感神经共同维持身体平衡。

Specially trained dog can open, close, to help the owner to maintain body balance, which can help patients with Parkinson disease to maintain independent living.

经过特殊训练的狗可以开门、关门、帮助主人保持身体平衡等，因而可帮助帕金森病患者保持独立生活。